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Finding the Fourth Proportional to 697.85, 1,047.35 and 351.28

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Solution

The fourth proportional to 697.85, 1,047.35 and 351.28 is: 527.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.85 : 1,047.35 = 351.28 : x
  2. Step 2: Convert to fraction form
    697.85/1,047.35 = 351.28/x
  3. Step 3: Cross multiply
    697.85x = 1,047.35 × 351.28
  4. Step 4: Simplify right side
    697.85x = 367,913.11
  5. Step 5: Solve for x
    x = 367,913.11/697.85
  6. Step 6: Final answer
    x = 527.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.